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Apple's mobile phone download software shows that the signature does not require additional certificates.
You can consider downloading from another channel, preferably from the corresponding software official website and application market.

The solution is: 1 Turn on the phone. When we install some software, the system will prompt us that the installation package does not contain any certificates. 2. Then, find the setup tool. 3. Next, you need to click Security and Privacy. 4. Next, you need to select more security settings. 5. Click the button after downloading the external source application to open it. 6. At the same time, turn off the external source application check. 7. Finally, try to install the certificateless tool again.